Beating-engine.



M. A. MILLS.

BEATlNG ENGINE.

APPLICATION FILED SEPT-20.19%.

Patented July 16, 1918.

2 SHEETSSHEET 1.

M. A. MILLS.

BEATING ENGINE.

APPLICATION FILED SEPT- 20, IQIG.

1 ,272,837. Patented July 16, 1918.

2 SHEETSSHEET 2.

MELVIN A. MILLS, OF METHUEN, MASSACHUSETTS.

BEATING-ENGINE.

Specification or Letters Patent.

Application filed September 20, 1918. I Serial No. 121,228.

To all whom it may concern:

Be it known that I, MELVIN A. MILLS, a citizen of the United States, residin at Methuen, in the county of Essex and tate of Massachusetts, have invented certain new and useful Improvements in Beating-Engines, of which the following is a specification.

This invention relates'to paper making machinery and has special reference to a novel improvement in beating engines, whereby the rapidity and uniformity of circulation of the pulp is increased and the dis integration for shredding of the raw stock is accelerated.

' The ordinary type of beating engine having parallel circulating channels and the beating rolls therein, also includes relatively high backfall located at the delivery side of each roll, over which the pulp mass or stock is forced by the rotation of the rolls. It has been found in engines of this type that the stock does not become thoroughly shredded or disintegrated because of the hindrance or resistance that the backfall offers to the circulation. That is to say, in engines employing a backfall, when the stock is lifted up over the latter by the roll, there is a tendency for the heavy stock to settle close to the rear side of the backfall, and also han or collect along the bottom of the tub, Wllli the finer -stock only makes the circuit. This settling of half-beaten stock, not only requires a greater length of time to complete the beating operation, but prevents the stock produced by the engine from being of a uniform grade and quality, and therefore reduces the efliciency of the engine.

In my former Patent No. 726,726, dated April 28, 1903, I have shown a construction whereby the undesirable conditions above referred to may be eliminated to a maximum extent by doing away with a backfall, and the present invention also having this end in view contemplates an improvement-upon the former construction, whereby more perfect and more rapid circulation of the stock in the pulp tub is maintained throughout the beating operation so that the stock will not settle and clog.

Accordingly, .it will be apparent that the present invention contemplates, as one of its objects, the elimination of the backfall at the delivery side of the beater roll, and the utilization of a novel construction which cooperates with the beater roll'to impart a propelling action to the stock delivered from the roll, thus producing a powerful pressure at the delivery side of the roll which takes the place of the backfall and prevents the stock from backing onto the roll and carrying over to the feeding side thereof. Thus, the improved propulsion drives all of the shredded stock to the bottom of the tub so that there is no settling of heavy particles at any point along the bottom thereof, and consequently all of the stock may be uni formly acted upon by the beating rolls.

A further object of the invention is to provide an arrangement which offers less resistance to the beater rolls and conse- That is to say, the invention has in View in addition to an improved circulating system, such a construction that will aid the beater roll in its disintegrating action, and keep Patented July 16, 1918.

' quently requires less horsepower to operate.

the same free or clear of stock, a great quantity of which on some machines 15 carried around with the roll many times before being completely broken up, thus prolonging the. beating operation and imposing extra pressure and resistance on the rolls. Therefore, the present invention is of much importance from a practical and commercial standpoint since the stock is rapidly kept on the move by the centrifugal force created by the turning of the beater rolls, and the latter are provided from carrying unbeaten stock around with them, thuseliminating undue friction and resistance which con-- sume horsepower.

With the above and other objects in view which will more readily appear as the natureof'the invention is better understood, the same consists in the novel construction, combination and arrangement of parts hereinafter more fully described, illustrated and claimed.

A preferred and practical embodiment of the invention is illustrated in the accompanying drawings, in which Figure 1 is a top plan view of my im-' proved beating engine.

Fig. 2 is a vertical sectional view taken through the center of one of the circulating channels.

Fig; 3 is a view similar to Fig. 2 of the opposite circulating channel.

Fig. 4 is an enlarged detail sectional view of a portion of one of the beater rolls, show corresponding parts throughout the several figures of the drawings.

In carrying the-present invention into effect, it is proposed to employ a pulp tu b 1 having therein a mid-feather 2 which d1- vides the tub into the parallel communicating circulating channels 3 and 4 respectively. In the channel 3 there is located a beater roll 5 of known construction while in the channel 4 there is also arranged a simllar beater roll 6. These beat-er rolls are mounted in offset relation on suitable supporting shafts having power connections whereby said rolls may be driven in opposite directions to cause the circulation of stock through the opposite channels of the tub to be acted upon in succession by-each beater roll which operates in connection with a .bed plate 13 located therebeneath on the bottom of the tub.

In order to facilitate the passage of the stock to the bed plate B where it may be broken or drawn out by the knives of the beater roll, and bed plate, there is provided at each side of the bed plate on the floor of the channel, a slightly inclined rise, the one at the feeding-in side of the plate being inclined upwardly toward the beater roll and constituting a feed apron 7, while the one on the delivery side of the roll is inclined downwardly, and constitutes a delivery apron 8.

Arranged transversely across each of the circulating channels 3 and 4, and providing a housing for each of the beater rolls 5, is a cover element or head 9 whose opposite end portions extend down into the clrculating channel and bear a novel relation to the beater roll, and the inclined feed and delivery aprons 7 and 8, above referred to. As will be observed from Figs. 2 and 3, the hood 9 is provided at its forward feeding-in end with a depending stock directing feed wing 10 which is inclined toward the periphery of the beating roll, and terminates in a horizontal plane substantially coincident with the axis thereof. The rear end of the hood is also inclined toward the periphery of the beater roll as indicated at 11, and terminates at a point considerably below the axis of the roll, and in relatively close proximity to the periphery thereof. That is to say, the lower end of the rear portion of the hood terminates at a point much closer to the edges of the knives carried by the beater roll, than does thelower edge of the feed wing. whereby the suction produced by the centrifugal action of the beater. roll is greatly augmented. It has already been found in practice that an effective disposition of these parts. is to have the wing 10 about four inches from the feed side of, the

roll while the delivery end of the hood is about one and one-half inches from the delivery side of the roll.

Arranged at the lower edge of the rear inclined portion ll of the hood is a downwardly inclined delivery wing 12 whose front edge is located at a point adjacent or below a horizontal plane intersecting the axes of the roll and which is disposed in the same general direction as the feed wing 10, that is, in the direction of flow. This wing 12 also converges slightly with the inclined surface of the delivery apron 8, and therefore, produces a converging constricted delivery or discharge passage or chute 13 whose general direction is downwardly toward the bottom of the tub, while the location and arrangement of the feed wing 10 provides a relatively large and capaeious inlet passage for the beater roll, which materially assists in directing the pulp or stock between the knife edges of the beater roll andtthe bed plate at the feeding-in side of the former.

The novel location and disposition of the delivery wing or plate 12, makes possible the use of a ledgerknife blade 14 to be carried thereby in such a manner that the cutting edge thereof projects into close proximity (about one and a half inches) to the edges of the beater knives, whereby upon rotation of'the beater roll in any direction of the arrows shown in the drawings, the said ledger blade will free the blades of the beater roll of any particles of stock that may be carried thereby. In this way. the roll is kept relatively clear and free from halfbeaten stock. However, a small proportion which may be carried over by the roll in its rapid rotation is thrown against the inner side of the inclined feed wing 10 and again conveyed into the path of the mass of pulp being sucked in the inlet passage and beneath the beater roll by the centrifugal pumping action roduced thereby. The presence of the le ger blade 14 at the point described also acts as a supplementary shredding shear and may be termed a wetshredder which opens up the stock and greatly assists the disintegration or shredding operation. Another one of its functions is to provide a removable member at the delivery side of the roll which may be carried by the delivery wing and placed in such close proximity to the periphery of the beater roll,

tion to the periphery of the roll that a relatively large inlet or feeding mouth is provided there-for at the feeding-in side of the roll, while a constricted downwardly incline converging delivery chute is provided at the delivery side of the roll for directing all of the pulp downwardly toward the bottom of the tub. Upon the rapid rotation of the beater roll, the same cooperates with the novel hood elements described to act as a. centrifugal pump which produces a powerful propelling effect to the pulp mass and creates a high pressure from the discharge or delivery side of the roll which takes the place of the usual backfall and prevents the stock from coming back of the roll and being carried over thereby. Accordingly, it will be apparent that the present construction and arrangement provldes for the rapid circulation of the stock in the tub, and to this end proposes to direct all the stock delivered from the. beater rolls at high pressure directly into the pulp mass below the level thereof and thereby forcibly drawing ahead the whole body of stock, and preventing settlement of the heayier particles and greatly facilitating the beating operation, so that all of the heavy particles of stock are kept moving, thus carrying therewith all of the stock in the upper part of the channels.

Furthermore, position of the 14 prevent back the arrangement and disdelivery wing 12 and plate pressure on the roll which would otherwise exist in the absence of a backfall. As previously indicated in engines employing a backfall, the latter takes the back pressure off of the roll, but where no backfall is provided to purposely eliminate the objectionable tendency of the stock settling at one "side thereof, it is essential to utilize means for relieving the roll of back pressure just the same.' Accordingly, the present construction accomplishes the important function of relieving the roll of back pressure and at the same time assists both the circulation and maceration of the stock, by utilizing a delivery wing inclined in the direction of How and supporting a. wet shredder plate whose working edge is arranged relatively close to the roll and adacent or below a horizontal plane located at the" axis thereof.

lVithout further description, it is thought that the many features and advantages of the present invention will be readily apparent, and it will, of course. be understood that various changes in the form, proportion, and minor details of construction may be resorted to without departing from the spirit of the invention or scope of the appended claims.

I claim: I

1. In a beating engine. a pulp tub having a circulating channel, a disintegrating tension of the hood and cooperating with the floor of the channel to form a constricted outlet.

2. In a beating engine, a pulp tub having a circulating channel, a disintegrating roll therein, and a hood arranged across the channel over the roll and having means at the delivery end thereof for forming a downwardly inclined chute having a constricted outlet below the axis of the roll, thus providing a delivery passage for the stock beneath the pulp level whereby the heavier particles of the stock are propelled around the channel by the force of the stock issuing from said constricted outlet.

3. In a beating engine, a pulp tub having a circulating channel, a beater roll arranged therein, a hood for said roll having a stock directing wing depending from the front edge thereof and inclined toward the feeding-in side of the roll, and another stock directing wing depending from the rear edge of the hood and inclined downwardly and away from said roll.

4. In a beating engine, a circulating channel zontal substantially at bottom, a disintegrating roll in said channel, and a hood arranged across the channel over the roll and forming with the bottom of said channo] a substantially horizontal delivery passage for the stock beneath the roll, and a downwardly inclined chute formed by one end of said hood and the bottom of the channel, said chute being below the axis of the roll and having a constricted outlet into the channel belowthe pulp level thereof.

5. In a beating en 'ne, a pulp tub having a circulating channe ,'a beater roll arranged in said channel, a hood for said roll hava pulp tub having rovided with a hori- -ing'tl 1e front and rear end portions thereof located on opposite sides of the roll and disposed in such ielation thereto as to provide a relatively large intake passage and a constricted converging delivery chute.

6. In a beating engine, a pulp tub having a circulating channel, a beater roll arranged therein, a hood directing wing depending from the front edge thereof and inclined toward and terminating a short distance from the feedingin side of the roll and approximately at. a point in a horizontal axis of the roll, and another-stock directing wing depending from the rear edge of the hood and inclined downwardly and away from the roll, said wing having its front edge portion arranged for said roll having a stock 2 plane intersecting the 25 in close proximity to the periphery of the roll and disposed below the axis thereof.

7 In a beating engine, a pulp tub having a circulating channel, a beater roll arranged therein, a hood for said roll having a stock directing wing depending therefrom at the feeding-in side of the roll and inclined thereto, and also having another stock directing wing depending therefrom at the delivery side of the roll and inclined downwardly and away therefrom, said wings being respectively located on opposite sides of a horizontal'plane intersecting the axis of the roll.

8. In a beating engine, a pulp tub having a circulating channel, a beater roll arranged therein, a hood for said roll, and having a stock directing wing depending therefrom at the feeding-in side of the roll and inposed below the horizontal axis of the roll and inclining rearwardly and downwardly, and a ledger blade having its projecting cutting edge at the upper edge of said inclined wa 10. In a beating engine, a pulp tub having a circulating channel, a bed plate arranged in said channel, oppositely inclined feed and delivery aprons arranged on each side of the bed plate, a heater roll arranged above said bed plate, and a hood for said beater roll having feed and delivery wings at each end 1 thereof, said feed wing being inclined toward the periphery of the roll and spaced therefrom, and said delivery wing being inclined away from the roll, and a ledger blade carried by said latter wing and projecting into close proximity with the periphery of the roll.

11. In a beating engine, a pulp tub'having a circulating channel, a bed plate arranged in said channel, oppositely inclined feed and roll, and said delivery wing cooperating" with the delivery apron to provide a downwardly directed converging delivery chute, and a ledger blade carried by said delivery wing andhaving one edge portion thereof in close proximity to the beater roll. 7

12. In a beating engine, a pulp tub having a circulating channel, a beater roll arranged in said channel, and a, hood for said roll having feed wings inclining downwardly toward the bottom of the tub and in the direction of flow, one of said wings having its edge portion spaced from the beater roll and the other of said wings carrying a ledger blade arranged in relatively close proximity to said beater roll.

13. In a beating engine, a pulp tub having a circulating channel, a beater roll journaled in the tub across the channel at a point between the planes of jthe top and bottom of the tub, a hood arranged across the channel over the roll and havin gla wing depending from the front edge therdof and inclined toward the roll, and also having another wing located at the rear edge thereof and inclined downwardly and away from the roll and cooperating with the floor of the channel to provide a constricted deliviery mouth at the discharge side of the rol 14. In a beating engine, a pulp tub having a circulating channel, a roll therein, a hood for said roll having correspondingly inclined wings-depending from the front and rear edges thereof, the wing depending from the rear edge inclining downwardly and away from the roll and cooperating with the floor of the channel to provide a constricted outlet located in a plane tangential to the bottom of the roll.

In testimony whereof I hereunto afiix my signature in the presence of two witnesses. MELVIN A. MILLS. Witnesses:

R. G. -MASTERTON, D. F. KEEFEJ 

